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xxdeMacBook-Pro:~ y$ node -v

v10.16.3

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xxdeMacBook-Pro:~ y$ npm -v

6.9.0

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xxdeMacBook-Pro:~ y$ sudo npm cache clean -f

Password:
npm WARN using --force I sure hope you know what you are doing.

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xxdeMacBook-Pro:~ y$ sudo npm install -g n

/Users/y/npm_installs/bin/n -> /Users/y/npm_installs/lib/node_modules/n/bin/n
+ n@6.6.0
added 1 package from 4 contributors in 1.251s

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xxdeMacBook-Pro:bin y$ sudo n stable

installing : node-v12.18.2
mkdir : /usr/local/n/versions/node/12.18.2
fetch : https://nodejs.org/dist/v12.18.2/node-v12.18.2-darwin-x64.tar.xz

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sudo npm install npm@latest -g

+ npm@6.14.6

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xxdeMacBook-Pro:~ y$ node -v

v12.18.2

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xxdeMacBook-Pro:~ y$ npm -v

6.14.5